ATTINY44A-MMHR Atmel, ATTINY44A-MMHR Datasheet - Page 175
ATTINY44A-MMHR
Manufacturer Part Number
ATTINY44A-MMHR
Description
MCU AVR 4KB FLASH 20MHZ 20QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY44A-MMHR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
12
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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20.4
20.4.1
Table 20-2.
20.4.2
Figure 20-2.
Table 20-3.
8183C–AVR–03/11
Calibration
Method
Factory
Calibration
User
Calibration
Symbol
1/t
t
t
t
t
t
Δt
CLCL
CHCX
CLCX
CLCH
CHCL
CLCL
CLCL
Clock Characteristics
Accuracy of Calibrated Internal Oscillator
External Clock Drive
Parameter
Clock Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period from one clock cycle to the next
Calibration Accuracy of Internal RC Oscillator
External Clock Drive Characteristics
External Clock Drive Waveform
V
IL1
Fixed frequency within:
Target Frequency
V
It is possible to manually calibrate the internal oscillator to be more accurate than default factory
calibration. Note that the oscillator frequency depends on temperature and voltage. Voltage and
temperature characteristics can be found in
page
Notes:
7.3 – 8.1 MHz
IH1
8.0 MHz
238.
1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
Fixed voltage within:
1.8V – 5.5V
V
3V
CC
V
Min.
250
100
100
CC
0
= 1.8 - 5.5V
Max.
Figure 21-109 on page 237
2.0
2.0
4
2
Fixed temperature
-40°C to +85°C
Temperature
V
within:
Min.
25°C
100
CC
40
40
0
= 2.7 - 5.5V
ATtiny24A/44A/84A
Max.
1.6
1.6
10
2
Accuracy at given voltage
V
Min.
CC
50
20
20
0
and
& temperature
= 4.5 - 5.5V
Figure 21-110 on
±10%
±1%
Max.
0.5
0.5
20
2
(1)
Units
MHz
ns
ns
ns
µs
µs
%
175
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